diff --git a/apps/emqx/src/emqx_persistent_session_ds_gc_worker.erl b/apps/emqx/src/emqx_persistent_session_ds_gc_worker.erl
index bf607804f..af387d2ca 100644
--- a/apps/emqx/src/emqx_persistent_session_ds_gc_worker.erl
+++ b/apps/emqx/src/emqx_persistent_session_ds_gc_worker.erl
@@ -82,7 +82,7 @@ try_gc() ->
     CoreNodes = mria_membership:running_core_nodelist(),
     Res = global:trans(
         {?MODULE, self()},
-        fun() -> ?tp_span(ds_session_gc, #{}, start_gc()) end,
+        fun() -> ?tp_span(debug, ds_session_gc, #{}, start_gc()) end,
         CoreNodes,
         %% Note: we set retries to 1 here because, in rare occasions, GC might start at the
         %% same time in more than one node, and each one will abort the other.  By allowing
diff --git a/apps/emqx_durable_storage/src/emqx_ds.erl b/apps/emqx_durable_storage/src/emqx_ds.erl
index 649341eb5..6b371cf79 100644
--- a/apps/emqx_durable_storage/src/emqx_ds.erl
+++ b/apps/emqx_durable_storage/src/emqx_ds.erl
@@ -195,7 +195,7 @@ store_batch(DB, Msgs) ->
 %% replay. This function returns stream together with its
 %% "coordinate": `stream_rank()'.
 %%
-%% Stream rank is a tuple of two integers, let's call them X and Y. If
+%% Stream rank is a tuple of two terms, let's call them X and Y. If
 %% X coordinate of two streams is different, they are independent and
 %% can be replayed in parallel. If it's the same, then the stream with
 %% smaller Y coordinate should be replayed first. If Y coordinates are